I am not complaining I am just trying to understand it and utilize it. After I hit level 10 in the vampire ranks and unlocked everything in the tree ever so often about 3 or 4 times a night (I usually play every night for 1 to 3 hours) I go extremely fast for about 4 to 6 seconds completely randomly. There is no rhyme or reason to it that I can tell. Just for some odd reason out of the blue if I am sprinting I will go about two times the speed of a leveled up sprinting horse if running next to it, and if I am in combat my silver bolts sound like a machine gun. Then as quickly as the speed comes it goes. I like it, sometimes in combat it is very useful I just want to know what triggers it? Or is this a bug? I know we get the speed increase at level 9 vampirism but this is only while sneaking. Has anybody else experienced this? or is this something known to all and I am left in the dark to it?